Safety device



w. F. PURCELLf SAFETY DEV ICE. APPLICATION FILED NOV.2. I916.

l 338,86'7 Patented May 4, 1920.

2 SHEETS-SHEET I.

FIGI

. I {Inna/M07 $51 SrtOT/MCQ W. F. PURCELL.

SAFETY DEVICE. APPLICATION FILED Nov. 2. 1916.

Mama May 4,1920.

2 SHEETS-SHEET 2.

WILLIAM F. PURCELL, OF MORRISTOWN, NEW JERSEY.

SAFETY DEVICE.

Specification of Letters Patent.

Patented May 4, 1920.

Applicationfiled November 2, 1916. Serial 110,129,042.

To all whom it may concern:

Be it known that I, WILLIAM F. PURCELL, a citizen of the United. States, and a resident of the city of Morristown, in the county of Morris and State of New Jersey, have invented certain new and useful Improvements in Safety Devices, of which the following is a specification.

My invention relates to safety devices and refers particularly to that form of device intended to increase the safety of elevators.

One object of my invention is a device whereby the door of an elevator shaft may be unlocked from within the elevator car.

Another object of my invention is a device whereby the door of an elevator shaft may be retained in a locked condition when the elevator car is not in a predetermined position with regard to the shaft door.

Another object of my invention is a device whereby either the shaft door or the elevator car will remain in a locked position.

Another object of my invention is, a device whereby the opening of a shaft door will prevent the movement of the elevator car-when at any predetermined position.

Another object of my invention is a device'whereby the closing of a shaft door will unlock the elevator car and allow of its movement.

Another object of my invention is a device whereby an elevator car cannot move from a standing position before a shaft door while said door is in an open position.

Another object of my invention is a device whereby the operator of an elevator car can unlock a shaft door, such act locking the car from movement and preventing the movement of the car until the" door is closed, the closing of the door causing it to be locked and unlocking the car for movement.

These and other objects of'my invention will be evident upon a consideration of my specification and claims. 7

In order that a safety device .of this character may be properly effective, it must be simple in construction, positive in action and of such a character that the movement of the elevator car. from the shaft opening be absolutely impossible until the door of the opening is closed and locked.

It is evident that thisresult can be obtained only when the locking and unlocking means of the shaft door is synchronously connected with the locking and unlocking power means of the elevator car. In other words, it is essential not only that the movement of the car be prevented until the shaft door is closed, but that it be further prevented until the shaft door is looked in a closed position.

These and other valuable features are possessed by my device which is economical of production, simple in construction, and not liable to become disordered by the strenuous use to which such devices are subjected.

Other valuable features of my device are its adaptability as a locking mechanism to all kinds of movable doors, whether they be movable horizontally or vertically, and swing doors, and its equal effectiveness upon all elevators irrespective of the kind of motive power.

The invention consists in certain details of construction and combinations and arrangements of parts, one embodiment of which is illustrated in the accompanying drawings described in the specification and defined in the claims. 7

Similar reference characters designate similar parts throughout the several views of the drawings in which- Figure 1 is a' perspective view (partly broken away to disclose some of the mechanism) showing an elevator car at a landing, the shaft gate being unlocked and the car rendered inoperative.

Fig. 2 is a plan view of Fig. 1.

Fig. 3 is a perspective view of the shoe mechanism used to obtain co-action of the parts of the device mounted on the car with the locks for the shaft doors.

, Fig.4: is an elevation showing the position of the-parts of the look when the shaft door is locked.

, Fig. 5 isa similar view showing the position of the parts when the shaft door is unlocked.

Fig. 6 shows an application of the lock to a door that opens vertically.

Fig. 7 shows a modification of the door locking parts as applied to a hinged door set flush with the shaft wall.

Fig. 8 is a sectional view of the lock on r the line X-X of Fig. 7 and Fi 9 is a section of the car floor showing t e position of the parts when the car is moving.

Referring tothe drawings in detail (see Figs. 1 and 2) 10 indicates a door of an elevator shaft of the sliding type which is arranged to open in the direction indicated by the arrow and 11 is the wall of the shaft. A look 12, one of which is provided for each door of the shaft, is bolted to the wall one of which is adapted to receive the end of the fingerpiece 13, and the others to receive the end of a spring-pressed bolt 18 which is slidably mounted in the base memher. The purpose of this plurality of indents is to adapt the lock for use with doors or gates of differenttypes, as for instance those opening right, left, or vertically. The said bolt 18 is provided with a projecting stud 19 for the purpose of causing the locks for the shaft doors to coact with the parts of the device mounted on the elevator car as will presently appear.

I will now describe the parts of the device carried by the car, referring particularly to Figs. 1, 2, and 9, of the drawings, in which the numeral 20 denotes the platform of the car. The controller 21 shown is of a conventional type for an electrically driven car, except that the switch lever 22 is furnished with a projecting finger'23, a member 24 is pivotally attached to the controller box at 25, so that it is capable of a limited swinging motion toward and from the diametrical center of the same, and has a surface 26 curved concentric to the axis of the switch lever. An indent 27 is formed in the said surface so located that when the switch lever is at its neutral position, if the member 24 is moved upwardly, the finger23 of the switch lever will enter said indent. 28 indicates a rod connecting the member 24 with one arm 29 of a walking beam located under the car. This walking beam has a resilient arm 30, shown as a leaf spring, the weight of which with its supported pedal 32 is greater than that of the rod 28 and the arm 29, to maintain an upward pressure upon the rod 28 and is alsoprovided with a downwardly extending arm 31. A pedal 32 is mounted in the floor of the car so as to bear against the resilient arm 30. The function of this pedal will later be explained. i V v j The part of the device by which the locks of the shaft doors are interlocked with the mechanism for locking the switch lever, and which will hereinafter be referred to as the car shoe, is shown in perspective in Fig. 3.

, arm 31 of the walkin It consists preferably of a slide member 34 suitably mounted on a bracket 35 so that it is movable longitudinally of the ap between the car and the sill of the shaft door. Vertically fixed to the slide member are two bars 36 and 37 spaced apart so that one will be on either side of the door lock stud 19, when the platform of the car is within a predetermined distance above or below a landing floor, this distance depending on the length of the bars, which, it will be noted, are outwardly curved at their ends to insure their engaging the lock stud.

The slide member 34 is normally held by a spring 38 (see Fig. 9) in such a position that the bars 36, 37, will freely straddle the stud 19 when the shaft door is locked, and a chain 39 connects one end of the slide member with the downwardly extending beam. The numeral 40 in icates a switch adapted to open and close the car motor circuit and to be operated by a projection 41 on the slide member 34 when the latter is moved.

The operation of the device is as follows: By reference toFigs. 4 and 6 of the drawings, it will be seenthat when the shaft door 10 is closed the end of the finger piece 13' is received in the indent 17 of the rotatable disk 16, and the end of the spring-pressed bolt 18 enters its indent 44 in said member, therefore as it is necessary to partially rotate the member 16 to open the door, it will be apparent that the door is securely locked until the bolt 18 is withdrawn from its indent 44, as shown in Fi 5.

Assuming that the car 18 stopped so that its platform is within a predetermined distance of a landing floor, the switch lever 22 will be at its neutral position, and the car shoe bars 36, 37will straddle the stud 19 of the door lock, whereupon if the operatorplaces his foot on the pedal 32 and presses it downwardly, the walking beam under the car will be moved so as to lift the rod 28 and pull the chain 39, the result being that the member 24 will be swung upwardly, thereby engaging thefinger 23 of the switch lever 22, and locking the latter in its neutral position and simultaneously the car shoe will be moved so as to withdraw the bo1t18 of the door lock and also open the switch 40. The parts being in the position described, the switch lever is locked, the motor circuit opened, and the shaft door unlocked. If the door is now opened, as shown in Fig. 1, the disk member 16 will be partially rotated and the car shoe being in engagement with the stud 19 cannot return to its normal position until the door 10 is closed, whereupon the fingerpiece 13 will enter the indent 17 of the disk 16 and'turn the latter back until the spring-pressed bolt 18 slides into the indent 44, thus locking the door and permitting the spring 38 to return the car shoe to its normal position with the result that the switch 40 will be closed, the rod 28 pulled downward and the switch lever 22 unlocked.

Fig. 6 shows an application of the lock to a shaft door that opens vertically in which case the finger-piece 13 and bolt 18 engage diametrically opposite indents in the lock disk 16. Fig. 7 shows a modification of the device to adapt it for use on a hinged door set flush with the wall of the elevator shaft. As shown in this view the lock is mounted above the door and the car shoe would be mounted on the roof of the car. A slide bar 4-2 is mounted on the door having its upper end 43 bent to form the finger-piece that is engaged by the lock disk 16. When the door is in its locked position, as shown, it can be opened only by pulling downward the bar 42 and this can only be accomplished when the bolt 18 is withdrawn by the movement of the car shoe as already explained.

From the above it is evident that either the door or the car is always looked and that at no time are they both unlocked.

I do not limit myself to the particular size, number, shape or arrangement of parts as described and shown, all of which may be varied without going beyond the scope of my invention as described and claimed.

What is claimed, is:

1. In a safety lock for hatchway doors,

the combination with a hatchway door having a door iron movable toward and away from said look, a revoluble disk having a series of oppositely opposed indents having parallel sides within the disk, a slidable bolt capable of insertion within one indent preventing the movement of the disk and a spring tending to move the bolt toward the center of the disk, a second indent of the disk being arranged to receive the door iron on movement of the door toward the lock.

2. In a safety lock for hatchway doors, the combination with a hatchway door having a door iron movable toward and away from said look, a revoluble disk having a series of four oppositely opposed indents having parallel sides within the disk, a slidable bolt capable of insertion within one indent preventing the movement of the disk, a spring tending to move the bolt toward the center of the' disk, a second indent of the disk being capable of receiving the door iron of the hatchway door.

Si ned at New York city, in the county of ew York and State of New York, thi 31st day of October, 1916.

WILLIAM F. PUROELL.

Witnesses:

TERESA V. LYNCH, RITA LYNCH. 

